SCSI disk device and ATA device

johnrxx99

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Jan 3, 2015
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Hi All.

I have a home built PC using an Asus P6X58D-E, i7 processor, 16GB ram, windows 7 and 4 hard drives.

I recently installed a Crucial M550 ssd and the other 3 discs are 2xWD black and 1x green. Initially all 4 discs were connected to SATA2 ports but having checked speeds on the ssd I reconnected the ssd and one of the WD blacks to the 2xSATA3 ports on the MB. I didn't change cables and don't know if that matters although I've read that it doesn't.

My question is that the 2 drives connected to the SATA3 ports are showing in device manager as "SCSI disk device" whereas the other 2 drives connected to SATA2 ports show as "ATA device".

I know the two SATA3 ports on this MB have a Marvel controller, is this the reason and is it a problem?

Also, my new ssd seems to run relatively slowly compared to the published stats. Is this the Marvel ports or another issue? I used the ATTO benchmark program and it read/write average about 200 mbs.

Many thanks in advance.